Coffee-mill



(.NOMOdel.)

E. H. 8v G. MORGAN.

COFFEE MILL.

No. 3'3 3,243.- PatentedjDeo. Z9, 1885..

#fw/y dmim.

UNiTnD STATES PATENT OFFICE.

EDGAR H. MORGAN AND CHARLES MORGAN, OF FREEPORT, ILLINOIS.

COFFEE-MILL.

SPECIFICATION forming part of Letters Patent No. 333,243, dated December29,1885. Application filed February 9, 1885. Serial No. 155,402. (Nomodel.)

To all whom it may concern.:

Be it known that we, EDGAR H. MORGAN,

a resident of Freeport, in the county of Stephenson and State ofIllinois, and CHARLES MORGAN, a resident of Freeport, in the county ofStephenson and State of Illinois, have invented certain new and usefulImprovements in Coffee-Mills; and we do hereby declare the following tobe a full, clear, and exact description of the invention, such as willenable others skilled in the art to which it pertains to make and usethe same.

Our invention relates to improvements in coUee-mills, and is fullydescribed, explained, and claimed in the following specification, andshown in the accompanying drawings, in Which- Figure l is a sideelevation of the mill and the cover of the box on which the mill isfastened, the position of the box being shown in dotted lines and thehopper of the mill being partly broken away to show construction; Fig.2, a plan of the mill; Fig. 3, a plan of the grinding-shell and itsintegrally-formed supporting-arms, the position of the box beingindicated by dotted lines; Fig. 4, a central vertical section (throughline a Q, Fig. 3) of the grindingshell and cone andthe centralsupporting-bolt, n; Fig. 5, a plan, and Fig. 6 a section, of a centralbolt and washer slightly different in form from that shown in theprevious figures; Fig. 7, an internal elevation of the swinging cover ofthe mill, the view being in the direction indicated by the arrow a, Fig.2; and Fig. 8, a central vertical section of the cover through the linex y', Fig. 2, the view being in the direction indicated by the arrow a,Fig. 2.

In these views A is the top, and B are the side pieces, of a box ofordinary construction,

the side pieces being mitered or dovetailed together and the top nailedor screwed to the side pieces. rIhe lower part of one of the sides iscut away for the admission of an ordinary. drawer, and a bottom boardisfastened to the lower edges of the side boards and supports thedrawer. Immediately above the drawer-space is the main casting of themill, consisting of a conical grinding-shell, C, an integrally-formedbridge, E, above the shell,

and three integrally-formed arms, D, whose outer ends enter suitablesockets in three of the side pieces of the box. These sockets are formedin the side pieces before putting them together, and the connecting ofthe side pieces secures the casting in place. The end D of each of thearms D is cylindrical and iits in the socket prepared for it, and justinside of each of the cylindrical ends is a square shoulder, D, whichrests against the inner 6o face of the side piece, and thus steadies thecasting.

We are aware that it is not broadly new to fasten in p lace the maincasting of a colf'ee-` mill by providing it with projections which65enter the sides of the inclosing-box, a mill havingitshopperandstationary grinding-burr formed in a single piece, whoseedges enter grooves in two opposite sides of the box, being shown in aprior patent. The cylindrical 7o form of the ends of supportingarms(shown herein) is, however, preferable to any other shape, since thesockets for receiving said ends can be prepared more rapidly andperfectly by boring than in any other way. At the same time theshoulders on these arms, while not essential, add to the convenience ofconstruction, since they obviate the necessity of boring the sockets toan exact depth.

Above the main casting and resting onit is a sheet-metal hopper, G,lying wholly within the box, and held in place by the top A, which isfastened to the side pieces after the hopper has been put in place. Inthe top A is a circular opening somewhat smaller than the upu per rim ofthe hopper, in order that when the cover is fastened on, the hopper maybe secured thereby, and an annular metal plate, H, surrounds the openingin the top A, and is fastened securely to the top.

Ve are aware that it is not new to place the hopper of a coffee-millwithin the box and below the cover thereof but we believe this to be therst mill in which a sheet-metal hopper is superposed upon the stationaryburr of the mill within the mill-box and held in place by the coverwithout other fastening. The fastening thus afforded is perfectly rigidand secure, and costs absolutely nothing, since the box, the stationaryburr, and the cover of the roo' box must all be fastened togethersecurely, whether their connection holds the hopper in place or not.

In all prior constructions similar to this the hopper has been fastenedto the sides of the box, the cover, or the stationary grindingburr. isentirely separate from the box, the cover, and the stationary burr. Itrests on the grinding-burr, and is held in place by the hopper withoutbeing attached to either. e

Above the plate H is a semicircular stationary cover, H, closingone-half of the opening in the top A, and a semicircular cover, y

H', is pivoted at one extremity of the common diameter of the twosemicircles, and by swinging about this pivot opens or -closes theremaining half of the opening in the top.

At the'center of the cover H Hf is a small circular cap or plate, h,fastened to or forming a part of the stationary half H of the cover, andthis cap and the bridge E are centrally bored to receive and form thebearings of a .central bolt, n, screw-threaded at its upper end, headedat its lower end, and having a square neck just above the head. Agrinding-cone, C', having a square central opening, hangs on the head ofthe bolt within the shell C, the opening in the cone conformingsubstantially to the neck of the bolt, so that the bolt and cone mustturn together.

The use of a separate bolt for suspending' and rotating the cone Gispreferable to the use of an integrally-formed cone and vertical shank,for the reasons that the wrought bolt is cheaper, stronger, and moreperfect than a cast shank, and permits the making of amore perfectcone-casting, and at the same time the suspension of the cone on thebolt allows a certain amount of adjustment of the cone to the shellindependently of the position of the bolt. In mills of this class thegrinding-burrs are cast, aud are seldom absolutely perfect, and a slightautomatic lateral adjustment is almost a necessity to their successfuloperation.

On the upper surface of the cone G is aboss, L, of such thickness thatas the cone is raised by raising the bolt a, or otherwise, the bossstrikes the lower face of the bridge E before the periphery of the conestrikes the inner surface of the shell, and thus prevents theunnecessary wear of the grinding-surfaces, which might otherwise resultfrom too close an adjustment.

Above the cap h is a washer, c', fitting loosely about the central bolt,n, and above the washer is a regulatingnut, Z, by means of which thebolt is raised or lowered for the purpose of adjusting thegrinding-surfaces. `On the upper end of the bolt is screwed a crank, J,the end of the bolt lying in ascrewthreaded socket in the lower faceofthe crank. The washer i and crank J are connected by a verticalfinger, j, cast either on the washer or the crank, and entering asuitable socket in the In the mill shown herein the hopper.

other of said parts, and thus insuring the simultaneous rotation ofthetwo parts. The nut Zthus lies between two parts, which always move inthe same direction and at the same speed, and is thus guarded againstany friction which might tend to turn it with relation tothebolt. Toprevent its rotation through accidental causes or the jar of operation,a spring, m, is interposed between the crank J and the nut, and affordssufficient friction for the purpose. e

Figs. 5 and 6 show a form of washer which maybe substituted for the onealready described, As shown in those figures, one side of the bolt isflattened, and the central opening in the washer is made'to correspondwith the form of the bolt. The crank is fastened to the upper end of thebolt in the same way hQW in Figs. 1 and 2, and already described, andtheturning of theol-ank turns the bolt, which carries the washer with itat the same speed which the crank has. The operation of this device isthe same as that of the one already 4( escribed, though the construction1s somewhat different. f

The construction of the cover H H H so far as ithas already beendescribed is one that is common `in coffee-mills already in use, but wehave added to it a feature which we believe to be novel as well asuseful. O n ythe lower face vof the swinging cover H', near its pivotalpoint, is a vertical web, K, cast integral with the cover, the loweredge of the web being preferably a straight line in the plane of theupper surface of the plate H. When the hinged cover is closed and liesagainst the stationary cover H, the web K 1s over the hopper G, and theedge of the cover H rests on the plate H. As soon, however, as the coverH is swung open, the lower edge of the web rests on the plate H, andthese two parts are in contact during such time as the cover may beopen, whether wholly or partially. The friction of the swinging cover isthus brought on the metallic plate H instead of on the wooden top A, andthe wear caused by the friction is at a point which is always hiddenfrom view by the cover itself. The two metal parts K H also work muchmore smoothly together than the cover H would work on the surface of thewooden top A,cov-

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ered as it is with shellac or varnish. The addition of the web is thus amaterial improvement in the appearance and smoothness of operation ofthe top of the mill.

We are aware that many of the features of the mill shown are old andwell known, and we hereby disclaim any novelty therein, except such asis set forth in and covered by the following claims, to wit:

1. The combination, with the box of a coffeemill, of the main castingthereof provided with, arms having cylindrical ends, which enter socketsin the inner faces of two or more of the sides of the box, the castingbeing heldin place by the sides of the box when connected,

substantially as shown and described, and for the purpose set forth.

2. The combination of the sides B of the box and the1 stationarygrinding-shell C, provided With arms D D D, having cylindrical ends Dand shouldersD, the ends D being seated in sockets in the sides B, andthe shoulders D being in contact with the inner faces of said sides,substantially as shown and described, for the purpose set forth.

3. In a coffee-mill, the combination of the box thereof, agrinding-shell held in place within the box and at a suitable distancebelow the top thereof, and a sheet-metal hopper resting on thegrinding-shell and held in place by the top of the box, but not attachedto the grinding-shell or to the top of the box, substantially as shownand described, and for the purpose set forth.

4. The combination of the stationary shell C, provided with thecentrally-bored bridge, E, the bolt n, journaled in said bridge, thecone C', suspended within said shell, and supported and rotated by thehead of the bolt n,

and provided With the boss L, the crank J, attached to the upper end ofsaid bolt, and means for raising and lowering the bolt and cone,substantially as shown and described, and for the purpose set forth.

5. The combination of the bolt n, the nut Z, the Washer z', the nger j,and the spring m, substantially as shown and described, and for thepurpose set forth.

6. The combination of the top A, the annular plate H", the stationarycover H, and the hinged cover H', provided with the web K, substantiallyas shown and described, and for the purpose set forth.

In testimony whereof we have signed this specification in the presenceof two subscrib- 4o ing Witnesses.

EDGAR H. MORGAN. CHARLES MORGAN. Witnesses:

J. A. GRAIN, v F. W. BRAINERD.

